global-variables

问题 I'm trying to figure out how to not use global variables for my application but I can't think of anything else. I'm actually coding a web interface with the help of the Flask-SocketIO module to interact in real time with a music player. This is a snippet of my code containing the play function (I think I only need one example and then I can adapt it for all the other functions): from flask import Flask, render_template from flask_socketio import SocketIO app = Flask(__name__) socketio =

问题 I've recently updated my old Lua 5.1 project to the newest version of the library, and I'm having problems with LUA_GLOBALSINDEX - it became undefined. I only used it in lua_getfield functions, like so: void luastartgame(void) { if(startgamefunction.empty())return ; lua_getfield(globalL, LUA_GLOBALSINDEX, startgamefunction.c_str()); // go to function in Lua script int numArgs = 0; int res = lua_pcall(globalL,numArgs,0, 0); if(!luaresf(res)) // did the function call result in an error? {

问题 I have about 15-20 Google Apps Script projects which all use the same list of global variables. What I've done is defined all of the globals at the top of the first script file in the project, and then copied and pasted the block of code to the same spot in each project. So if I make a change in one, I copy and paste the entire thing from that one to the rest of them. It gets time-consuming. Is there a better way to do this? Is it using Libraries? Does anyone use Libraries for defining

问题 I'm currently doing a project in C# with a lot of rendering, and throughout almost all the classes there's a constant value of the type integer being used for scaling of the rendering. I know I could define this constant in one place as a normal variable and then pass it around, but this seemes really cumbersome. When is it acceptable to use static variables in C#? The easiest solution to my problem would be to create a class containing the static variable that all the other classes could

问题 Hi I'm currently coding in MATLAB and C. I have compiled MATLAB functions into a C shared library using MATLAB Compiler (mcc), and called the functions in the shared library in a C++ program. Can a global variable be declared to share data between MATLAB functions when called in C++? To be exact, if there is a function matlabA() and function matlabB() in matlab, and is compiled into c++ shared library using mcc compiler as cppA() and cppB() , can I share a variable between them just by

问题 I need to write a module that will be available on the window global. I'm using es6 to create the module and every single class I define has it's own file. I'm using webpack to babelify and bundle these classes. The entry point of my module is also the file containing the global to be exposed. I've tried every method to make this possibe, icluding: expose-loader import-loader expoert-loader output: library black-magic :( Example of code I've tried: I want to get: window.MyMod // mymod.js

问题 In GOLANG, Is there a way to make a variable's scope local to a file within a package? In my case, there are 2 files ex1.go and ex02.go. ex01.go defines a global variable var wg sync.WaitGroup which is used across functions in that file. In another file ex02.go (which has no relation with ex01.go except that both ex01.go and ex02.go belong to the same class of problems - i.e. concurrency), I can't define a variable for waitGroup as var wg sync.WaitGroup I get an error - "variable name is re

问题 This question only applies to Haxe version < 2.10 I've known about haxe for a while, but never really played with it until yesterday. Being curious, I decided to port showdown.js, a javascript port of markdown.pl, to haxe. This was pretty straightforward, and the javascript it generates seems to run fine ( edit: If you want to see it in action, check it out here). However, I noticed that the generated code dumps a ton of stuff in the global namespace... and what's worse, it does it by

问题 I'm trying to write a function in R that drops columns from a data frame and returns the new data with a name specified as an argument of the function: drop <- function(my.data,col,new.data) { new.data <<- my.data[,-col] return(new.data) } So in the above example, I want a new data frame to exist after the function is called that is named whatever the user inputs as the third argument. When I call the function the correct data frame is returned, but then if I then try to use the new data

问题 What is the difference between static global and non- static global identifier in C++? 回答1: Static limits the scope of the variable to the same translation unit . A static global variable has internal linkage . A non-static global variable has external linkage . Good Read: What is external linkage and internal linkage? 回答2: A global static variable is only available in the translation unit (i.e. source file) the variable is in. A non-static global variable can be referenced from other source